Standoff between protesters and police in Hong Kong

The video begins with an introduction, followed by an apology and clarification of previous points.

How might the context of the conversation influence the meaning of 'He'?

What did the speaker mean by 'I filled out.'?

In what situations might someone say 'I filled out.'?

What emotions might the speaker be expressing with 'I'm sorry again.'?

What could be the reason for the speaker's apology?